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End effects in optical fibres.

Allington-Smith, J. and Dunlop, C. and Lemke, U. and Murray, G. (2013) 'End effects in optical fibres.', Monthly notices of the Royal Astronomical Society., 436 (4). pp. 3492-3499.


The performance of highly multiplexed spectrographs is limited by focal ratio degradation (FRD) in the optical fibres. It has already been shown that this is caused mainly by processes concentrated around the mounting points at the ends of the fibres. We use the thickness of rings produced in the far-field when a fibre is illuminated by a collimated beam, to estimate the size of the region where the FRD is generated. This requires the development of a new model, using features of existing ray-tracing and wave-based models, which fits existing data very well. The results suggest that the amount of FRD is primarily determined by the length of fibre bonded into the supporting ferrule. We point out the implications for the production of future fibre systems.

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Publisher statement:This article has been accepted for publication in Monthly notices of the Royal Astronomical Society ©: 2013 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.
Date accepted:25 September 2013
Date deposited:22 April 2016
Date of first online publication:29 October 2013
Date first made open access:No date available

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